Tool/software:
Hi TI experts
I tried rpmsg sample code to send message from m62x to M4.
I wonder how many message can send from m62x without receive any message from other MCU.
so I fixed rpmsg_char_ping() function of rpmsg sample source code such as following that.
(delete recv_msg() function, only send function)
/* single thread communicating with a single endpoint */
int rpmsg_char_ping(int rproc_id, char *dev_name, int remote_endpt,
int num_msgs, char *msg_contents)
{
int ret = 0;
int i = 0;
int packet_len;
char eptdev_name[32] = { 0 };
char packet_buf[512] = { 0 };
rpmsg_char_dev_t *rcdev;
int flags = 0;
/*
* Open the remote rpmsg device identified by dev_name and bind the
* device to a local end-point used for receiving messages from
* remote processor
*/
sprintf(eptdev_name, "rpmsg-char-%d-%d", rproc_id, getpid());
rcdev = rpmsg_char_open(rproc_id, dev_name, remote_endpt,
eptdev_name, flags);
if (!rcdev) {
perror("Can't create an endpoint device");
return -EPERM;
}
printf("Created endpt device %s, fd = %d port = %d\n", eptdev_name,
rcdev->fd, rcdev->endpt);
printf("Exchanging %d messages with rpmsg device ti.ipc4.ping-pong on rproc id %d ...\n\n",
num_msgs, rproc_id);
for (i = 0; i < num_msgs; i++) {
memset(packet_buf, 0, sizeof(packet_buf));
sprintf(packet_buf, msg_contents);
packet_len = strlen(packet_buf);
printf("Sending message #%d: %s\n", i, packet_buf);
ret = send_msg(rcdev->fd, (char *)packet_buf, packet_len);
if (ret < 0) {
printf("send_msg failed for iteration %d, ret = %d\n", i, ret);
goto out;
}
if (ret != packet_len) {
printf("bytes written does not match send request, ret = %d, packet_len = %d\n",
i, ret);
goto out;
}
/* TODO: Verify data integrity */
}
printf("\nCommunicated %d messages successfully on %s\n\n",
num_msgs, eptdev_name);
out:
ret = rpmsg_char_close(rcdev);
if (ret < 0)
perror("Can't delete the endpoint device\n");
return ret;
}
then I execute file and got error messages
1. I can send 42 messages without any error
root@am62xx-evm:~# ./ti_send_only -r 9 -n 42 Created endpt device rpmsg-char-9-1054, fd = 3 port = 1024 [ 88.578465] omap-mailbox 29000000.mailbox: Try increasing MBOX_TX_QUEUE_LEN Exchanging 42 messages with rpmsg device ti.ipc4.ping-pong on rp[ 88.590224] k3-m4-rproc 5000000.m4fss: failed to send mailbox message, status = -105 roc id 9 ... Sending message #0: hello there 0! Sending message #1: hello there 1! Sending message #2: hello there 2! Sending message #3: hello there 3! Sending message #4: hello there 4! Sending message #5: hello there 5! Sending message #6: hello there 6! Sending message #7: hello there 7! Sending message #8: hello there 8! Sending message #9: hello there 9! Sending message #10: hello there 10! Sending message #11: hello there 11! Sending message #12: hello there 12! Sending message #13: hello there 13! Sending message #14: hello there 14! Sending message #15: hello there 15! Sending message #16: hello there 16! Sending message #17: hello there 17! Sending message #18: hello there 18! Sending message #19: hello there 19! Sending message #20: hello there 20! Sending message #21: hello there 21! Sending message #22: hello there 22! Sending message #23: hello there 23! Sending message #24: hello there 24! Sending message #25: hello there 25! Sending message #26: hello there 26! Sending message #27: hello there 27! Sending message #28: hello there 28! Sending message #29: hello there 29! Sending message #30: hello there 30! Sending message #31: hello there 31! Sending message #32: hello there 32! Sending message #33: hello there 33! Sending message #34: hello there 34! Sending message #35: hello there 35! Sending message #36: hello there 36! Sending message #37: hello there 37! Sending message #38: hello there 38! Sending message #39: hello there 39! Sending message #40: hello there 40! Sending message #41: hello there 41! Communicated 42 messages successfully on rpmsg-char-9-1054 TEST STATUS: PASSED
2. I got error messages when I sent 43 messages
root@am62xx-evm:~# ./ti_send_only -r 9 -n 43 Created endpt device rpmsg-char-9-1060, fd = 3 port = 1024 [ 26.746459] omap-mailbox 29000000.mailbox: Try increasing MBOX_TX_QUEUE_LEN Exchanging 43 messages with rpmsg device ti.ipc4.ping-pong on rp[ 26.758212] k3-m4-rproc 5000000.m4fss: failed to send mailbox message, status = -105 roc id 9 ... Sending message #0: hello there 0! Sending mess[ 26.771521] omap-mailbox 29000000.mailbox: Try increasing MBOX_TX_QUEUE_LEN age #1: hello there 1! Sending message #2: hello there 2! Send[ 26.783949] k3-m4-rproc 5000000.m4fss: failed to send mailbox message, status = -105 ing message #3: hello there 3! Sending message #4: hello there 4! Sending message #5: hello there 5! Sending message #6: hello there 6! Sending message #7: hello there 7! Sending message #8: hello there 8! Sending message #9: hello there 9! Sending message #10: hello there 10! Sending message #11: hello there 11! Sending message #12: hello there 12! Sending message #13: hello there 13! Sending message #14: hello there 14! Sending message #15: hello there 15! Sending message #16: hello there 16! Sending message #17: hello there 17! Sending message #18: hello there 18! Sending message #19: hello there 19! Sending message #20: hello there 20! Sending message #21: hello there 21! Sending message #22: hello there 22! Sending message #23: hello there 23! Sending message #24: hello there 24! Sending message #25: hello there 25! Sending message #26: hello there 26! Sending message #27: hello there 27! Sending message #28: hello there 28! Sending message #29: hello there 29! Sending message #30: hello there 30! Sending message #31: hello there 31! Sending message #32: hello there 32! Sending message #33: hello there 33! Sending message #34: hello there 34! Sending message #35: hello there 35! Sending message #36: hello there 36! Sending message #37: hello there 37! Sending message #38: hello there 38! Sending message #39: hello there 39! Sending message #40: hello there 40! Sending message #41: hello there 41! Sending message #42: hello there 42! Communicated 43 messages successfully on rpmsg-char-9-1060 TEST STATUS: PASSED
I could find 2 error log such as followings
- [ 26.746459] omap-mailbox 29000000.mailbox: Try increasing MBOX_TX_QUEUE_LEN
- [ 26.758212] k3-m4-rproc 5000000.m4fss: failed to send mailbox message, status = -105
but I could find only 2 times and after sending msg3 I can not receive any error
3.I tried sending 257 messages. and I got different error logs such as followings (timeout error log and application error log after sending 256th messages)
Sending message #255: hello there 255! [ 35.077819] omap-mailbox 29000000.mailbox: Try increasing MBOX_TX_QUEUE_LEN [ 35.088237] k3-m4-rproc 5000000.m4fss: failed to send mailbox message, status = -105 Sending message #256: hello there 256! [ 50.237617] rpmsg_chrdev virtio0.rpmsg_chrdev.-1.14: timeout waiting for a tx buffer Can't write to rpmsg endpt device : Unknown error 512 send_msg failed for iteration 256, ret = -1
it would be effected vring size 256 but I wonder test#2 error log timing.
resultly I would like to know such as followings.
1. Relationship between vring and mailobx : 1 vring = 1 mailbox ?
2. why error logs were appeared before sending first message( test#2)
3. why I can send max 42 messages without error logs(but buffer size is 256).
4. Sequence of message sending from user application to M4 core
(I searced other Core contents, is it same for am62x? : TMDS64EVM: About IPC and Mailbox - Processors forum - Processors - TI E2E support forums)
Thanks for your support as always!
